A U.S. Marine Corps helicopter crashed in Southern California Tuesday afternoon, killing all four crew members.

The USMC is withholding the names of the victims until their families can be notified.

Officials have not confirmed the military branch of the victims or if they were all Marines but all four are presumed dead, the USMC said in a statement.

At approximately 2:35 p.m., a CH-53E Super Stallion from the 3rd Marine Aircraft Wing at Marine Air Station Miramar crashed near El Centro, Calif., a city of about 44,000 people located 10 miles from the U.S.-Mexico border.

The cause of the crash is under investigation.

"We want to thank our friends and neighbors in the Imperial Valley for all of their support and prayers today," the Naval Air Facility in El Centro said in a statement.